Anything may be presented as evidence, you can deny that the evidence proves something but if you deny that it is evidence then you are a denialist. When evidence proves something beyond all reasonable doubt it becomes a fact. When it is a fact you know something and if it isn't you believe it rather than know it. All very simple. But, honestly, what is the point of discussing evidence when so many don't seem to understand the difference between proof and evidence?
"Denialist (noun): A person who refuses to admit the truth of a concept or that is by the of scientific or historical evidence"